Light-concentrating device



March 20, 1928. 1,663,308

C. F. JENKINS LIGHT CONCENTRATING DEVICE Filed Oct. 22, 1924 CHARLES CIS JENKINS, T: WASHINGTN, DISTRICT COLUMBIA.

s ren STATE LIGHT-CONENERATHT DEVICE.

Applicationfiled October 22, 19%. Serial Ito. t ltttl.

This invention relates to light sources, and black spot appears, a spot of uniform density means for applyingsame in a uniform, conand very small area. centrated form in restricted locations, and Should the cylinder be rotated this expohas for its principal ob'ect the application sure will develop as a black line laterally of of a large light source 0 high intensity in a the film. It at the same time the cylinder relatively concentrated form to a given sur: rotates carrying the point of light across the face covering the whole surface by repeated film, the film is moved longitudinally, by journeys thereacross, andwith as little time hand, for example, the exposed line would to loss as possible. develop as a diagonal on the film strip.

Heretofore the concentration of light from Again, in order that this tiny point of a high intensity source has been attempted light may be applied to the film efficiently, by applicant and othersby means of lenses that is, as nearly continuously as ossible, or mirrors, but difiiculties areencountered. the film is wrapped around the cylinder as For example there is the ima e or the source, nearly completely as the supporting of the it often a coil filament, and t at the surface lamp will permit.

is unevenly lighted. Again, there is otten It should be'particularly noted that degree insufiicient s ace in which-to locate the lens or" size of the point or the light channel is to accommo ate the two foci. an essential to success, a difference which is The device of this invention overcomes the difference between success and failure,- l these objections, as hereinafter described, and notjust a matter of degree.

illustrated in the drawings, and particularly Applicant is well aware that a funnelpointed out in the claims. 1 shaped channel is not the most efficient shape In the schematic drawings herewith Fig. for directing light but believes the invention l is a sectional elevation, and Fig. 2 an end is easiest understood by a light channel of at view of one application of this invention. this sha e. p

In the figures, A is a bearing, in which roll claim, is tates a shaft B, supporting a cylinder C, 1. ln apparatus of the class described, a

havin located therein a curved funnelcircularly-formed surface, the marking 30 shape rod or tube of glass, quartz or other means the source of which is located approxisuitable material, the small end of which lies mately at the axis of the circular surface, just inside aminuteaperture D in the shell and means'torfdirecting the marking means of the cylinder. The large end of the. "funinto pointed contact with said surface, in

nel-shaped element lies adjacent to the dea plane longitudinally removed from the 5 centred filament of lamp E. @n the outplane of location of the source.

1 side of the cylinder is a. light-sensitive film 2. The combination of alight source, a or ribbon F encircling the cylinder forperlight channel of a denser medium than air, haps four-fifths to five-sixths of its circumsaid light source located to project its light ference. into said "channel, said channel having a If it is remembered that light passes from minute clear opening at the end where light l a dense medium, as glass, water, quartz, etc, exits, anda llght-sensitive surface located into a less dense medium, as air, 'for exin front of the small end of the channel. am le, with difliculty, especially so if the 3. A light source, an apertured rotating lig t strikes the separating surfaces at an cylinder, alight channel of a denser medium 5 acute angle, the operation of the device is than air, said light source located to project s. almost self-explanatory, i. e., its light into said channel, said channel Light from the lamp enters the end of supported inside said cylinder and having a the funnel-shaped member C, and i's'preminute clear opening at the end where the vented from scattering by the reflecting wall light exists, the small opening in alignment thereof, compelling it tapass out at'the very W1th the aperture 1n said cyhnder, and a I small end in the aperture. D in the shell of light-sensitive film mounted on said cylinder. the c linder, light-chemically exposing the 4. A. light source, an a ertured rotating film so that in development a. minute; cylinder, a light channel 0 a denser medium than air, said light source located to project its light into said channel, said channel supported inside said cylinder and having a minute clear opening at the end where the light exits, the clear opening in alignment with the aperture in said cylinder, and a light-sensitive film mounted on said cylinder.

5. The combination of a light source, an

apertured rotating cylinder, said light source being located to project its light through the 10 aperture in said cylinder, and a light sensitive film mounted on said cylinder.

In testimony whereof I have aflixed my signature.

CHARLES FRANCIS JENKINS. 

